epsomite

noun

ep·​som·​ite

ˈepsəˌmīt

plural -s

: a mineral MgSo₄.7H₂O consisting of native Epsom salts usually occurring massive or in crusts (hardness 2.0–2.5, specific gravity 1.75)

Word History

Etymology

French, from Epsom, England, its locality + French -ite

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